Okay. I've got a customer who dropped off a 1990 MM and a 1987 D-50. The 87 has a rockin body but is carbureted and nobody took care of it. The 90 has been chopped(dancing bed and such). But has a good 4g64. Customer wants good 4g64 put into 87, which had the G63B. Get the under dash harness swapped, fuel tank wiring swapped, and instrument cluster swapped along with pcm. Cool. Put dash back in. Customer says that they now want working ac in the truck. Drops off some lines, the little "A/C" switch, and the compressor/bracket. Neither of these trucks had ac to begin with. I know I still need a condenser, accumulator and evaporator core, complete with thermostat. The wiring is what gets me. Looked at a wiring diagram for an 89 (which I assume is the same) and it has confused the heck outta me. Never wired an ac from scratch. I know the compressor is case grounded, and the power must go through the pressure switch before getting to the compressor. That's about it. Any ideas?
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